HADOOP-15286. Remove unused imports from TestKMSWithZK.java

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit 3dc30bc24e50343efe1f514b923d27a0786d3ac1)

hadoop-common-project/hadoop-kms/src/test/java/org/apache/hadoop/crypto/key/kms/server/TestKMSWithZK.java

@@ -19,58 +19,19 @@ package org.apache.hadoop.crypto.key.kms.server;
 
 import org.apache.curator.test.TestingServer;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.crypto.key.KeyProvider;
-import org.apache.hadoop.crypto.key.KeyProvider.KeyVersion;
-import org.apache.hadoop.crypto.key.KeyProvider.Options;
-import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension;
-import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension.EncryptedKeyVersion;
-import org.apache.hadoop.crypto.key.KeyProviderDelegationTokenExtension;
-import org.apache.hadoop.crypto.key.kms.KMSClientProvider;
 import org.apache.hadoop.crypto.key.kms.KMSRESTConstants;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.io.Text;
-import org.apache.hadoop.minikdc.MiniKdc;
-import org.apache.hadoop.security.Credentials;
-import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
 import org.apache.hadoop.security.authentication.util.ZKSignerSecretProvider;
-import org.apache.hadoop.security.authorize.AuthorizationException;
-import org.apache.hadoop.security.ssl.KeyStoreTestUtil;
 import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticatedURL;
-import org.junit.AfterClass;
 import org.junit.Assert;
-import org.junit.Before;
-import org.junit.BeforeClass;
 import org.junit.Test;
 
-import javax.security.auth.Subject;
-import javax.security.auth.kerberos.KerberosPrincipal;
-import javax.security.auth.login.AppConfigurationEntry;
-import javax.security.auth.login.LoginContext;
 import java.io.File;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.io.Writer;
 import java.net.HttpURLConnection;
-import java.net.InetAddress;
-import java.net.InetSocketAddress;
-import java.net.ServerSocket;
-import java.net.SocketTimeoutException;
-import java.net.URI;
 import java.net.URL;
-import java.security.Principal;
 import java.security.PrivilegedExceptionAction;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Properties;
-import java.util.Set;
-import java.util.UUID;
-import java.util.concurrent.Callable;
 
 public class TestKMSWithZK {